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  1. #1

    Carb Settings question

    Anybody know how many turns for the High and Low end screws?
    1996 Polaris SL900
    in my manual it says..
    High is: N/A
    Low is: 5/8 turn

    Any idea on the high end?


  2. #2
    Keihin CDK II 38mm Carbs

  3. #3
    I found this
    http://shopsbt.com/forum/t13981/
    Says its not adjustable, now what?

  4. #4
    ripcuda's Avatar
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    There are no High speed screws/adjusters on the Keihin carbs. All internal via the jets.

    Set your carbs to the factory settings:


    Attachment 241509

  5. #5
    So I'm totally lost as to what to do now. I have do rebuild on all 3 carbs, replaced fuel lines and even replaced a sheared o-ring in the fuel selector assembly. Cleared a blockage in the fuel separator.
    I have no High end adj, so I set all 3 Low settings to 5/8 (factory specs)

    Took it out again today and it is still chuggy.

    I noticed that If I slowly pull out the choke I can feather it with the throttle to get it to go like it is supposed to.

  6. #6

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    Getting the motor to run properly by manipulating the choke and throttle is a pretty good indicator that something has not been cleaned and/or reassembled properly in the carbs. If you have eliminated other possible causes of poor running, I would think a trip back through the carbs is in your future.

    Quote Originally Posted by Hagarules View Post
    So I'm totally lost as to what to do now. I have do rebuild on all 3 carbs, replaced fuel lines and even replaced a sheared o-ring in the fuel selector assembly. Cleared a blockage in the fuel separator.
    I have no High end adj, so I set all 3 Low settings to 5/8 (factory specs)

    Took it out again today and it is still chuggy.

    I noticed that If I slowly pull out the choke I can feather it with the throttle to get it to go like it is supposed to.

  7. #7
    I have not done pop off pressure tests yet.
    could that be the problem?

  8. #8
    MSX 150 guy lives on Mr. GP1800's Avatar
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    Your regulator arm height is a critical adjustment and often overlooked by most people. Get that set properly and it should work. Is your Accel pump primed and squirting fuel? You may even need to come out on your low speed screw.

    If you have the correct spring in the carb your popoff should be fine.

  9. #9
    I've pulled these carbs like 4 times now, when do I worry bout stretching or breaking one of the cables?

  10. #10
    ripcuda's Avatar
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    Quote Originally Posted by Hagarules View Post
    I've pulled these carbs like 4 times now, when do I worry bout stretching or breaking one of the cables?
    Eh? The throttle and choke cables are disconnected before you remove the carbs.

    Cheers!

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